Even FreeBSD can't be bothered to do a good job supporting Linux file systems. They're basically proprietary siloed file systems like the rest, even if code is available. Linux, meanwhile, can't be bothered to support either of FreeBSD's file systems officially. UFS2 is hardly patented anymore, but Linux doesn't care beyond read-only support.
Being open-source, and even being in a popular open-source project, does not make a standard, or even imply inferiority to those who do not implement it.
Being open-source, and even being in a popular open-source project, does not make a standard, or even imply inferiority to those who do not implement it.
https://xkcd.com/927/